Also on hand are the CEOs of United Airlines, Southwest Airlines and Frontier Airlines parent Republic Airways Holdings, among other carriers, as well as the chief executives of Expedia, MGM Mirage Hospitality and Travelport and John Pistole, administrator of the Transportation Security Administration.

The convention gathers travel-industry and corporate-travel executives, marketers and vendors. Some 6,000 attendees are expected at the four-day GBTA convention at the Colorado Convention Center. (Click here for the agenda.)

Sunday's schedule includes an opening-night reception at the Denver Performing Arts Complex, sponsored by the Visit Denver convention and visitors bureau, and a golf event at the Omni Interlocken Resort.